Over 2 Million Cylinders are currently in use. SCI has supplied cylinders to Scott, MSA, Drager, Survivair, Interspior and ISI for years, now Atlas can supply you direct!SCI offers replacement cylinders that meet or exceed all of the safety requirements set by NIOSH and NFPA, and at a substantially lower lifetime cost. All SCI cylinders are approved by the D.O.T. and TC and our line of Standard Cylinders is identical ( except for labeling variations ) to the cylinders purchased for resale by the SCBA air pack companies.The following SCI Cylinders are now avalable:2216 psi - 30 minute4500 psi - 30 minute4500 psi - 45 minute4500 psi - 60 minuteWith Standard Exterior Coating or with Dura-Lite 15+ Super Tuff Coating